Annular-mirror periscope.



" UNITED STATES PATENT oEEIcE.

JULES HUMBEEQHT, oE GEoss-LICII'IEEEELDE, NEAR BERLIN, GERMANY, AssIGNoE To THE EIEM ork orTIscHE ANsTALT c. P. GoEEz AKTIENGESELLSCHAFT, E EEIEDENAU, 'NEAR BERLIN, GERMANY.

AN'ULAR-MIRROR PERISCOPE.

ToaZZ rwhom it may concern:

Be it known that I, JULES HUMERECHT, a

citizen of the German Empire, and resident of Gross-Lichterfelde, near Berlin, Germany, have invented certain new and useful Improvements in and Relating to Annular- Mirror Periscopes, of which the followingl is a specification.

lespecially advantageous for submarine boats 1n so far as no optical elements are required extending over the annular mirror and subjected to water pressure during. the movement of the boat and adurable assembling of parts is easily secured. I

Figure 1 shows, optical elements of a periscope in accordance with this invention. Fig. 2 is a detail View on an enlarged scale of a portion of the'- -periscope shown in Fig. 1. f

The annular mirror of the periscope is Specification of Letters Patent.'

Patented Feb. 3,1914.

Application filed November 24, 1911.' `Serial No. 662,109.

designated l.' A @panoramic image such as 'would be produced by this annular mirror is indicated at 2l 3 is a Vnegative lens and 4 a reflector both a1'ranged`below the annular-mirror l and the reflector l concentrically thereto.

5 designates the image produced by the' negative lens 3, the optical ele'rA ents being so calculated that the images 2 ando are produced in the same plane.

G is a lens system which collects the divergent rays coming from the images 2 and 5 and produces images in the image plane 7 which can be observed by an ocular 8.

9 designates` al deviating prism.

What I claim is In a periscope un annular to produce an annular panoramic image and a device for producing a central image within said annular panoramic image said device consisting of a reflector positioned centrally to and below the annular mirror and of a Vnegative lens in front of said reflector and coperatng therewith.

In testimony whereof I have signed this speciication in the presence of two subscribing witnesses.

' JULES HUMBRECHT. Witnesses:

HENRY HASPER, WOLDEMAR HAUPT.

mirror adaptedA 

